具有快前沿的固态Marx电源的研究

Research on solid state Marx power supply with fast front

纳秒脉冲电场消融要求在100Ω负载上产生数千伏的纳秒脉冲,加快脉冲前沿有利于获得更窄的纳秒脉冲。提出了一种具有快速前沿的固态Marx发生器,在每级电路中插入一个电感,并且让放电管和充电管同时导通数十纳秒,等放电管完全开通后,关断充电管,对负载进行放电,以消除放电管和放电回路杂散电感对脉冲前沿的限制,获得具有快前沿的高压脉冲。搭建了32级Marx样机,实验中通过调节直通时间,在100Ω的低阻负载上获得了电压上升沿35 ns、脉宽800 ns、电流186 A的高压脉冲。对比并分析了充电管和放电管直通时间对上升沿的影响,发现直通时间越长,脉冲电流的前沿越快。输出端的峰值电流最大可达186 A。表明该脉冲电压源可以有效地提高电流的输出,提高系统带载能力。该方案相比于传统的改进方法,提高了系统抗干扰能力的同时,也减少了所使用开关管的数量,降低了脉冲电源的成本。

Nanosecond pulse electric field ablation requires the generation of thousands of volts of nanosecondpulses on a 100Ωload,and accelerating the pulse front is beneficial for obtaining narrower nanosecond pulses.Thisarticle proposes a solid-state Marx generator with a fast front,which inserts an inductor into each stage of the circuitand allows the discharge tube and charging tube to conduct simultaneously for tens of nanoseconds.After thedischarge tube is fully opened,the charging tube is turned off to discharge the load,eliminating the limitation of strayinductance on the pulse front by the discharge tube and discharge circuit,and obtaining a high-voltage pulse with a fastfront.A 32 level Marx prototype was built,and in the experiment,a high-voltage pulse with a voltage rise of 35 ns,apulse width of 800 ns,and a current of 186 A was obtained on a low resistance load of 100Ωby adjusting the throughtime.We compared and analyzed the effect of the direct time between the charging tube and the discharge tube on therising edge,and found that the longer the direct time,the faster the front of the pulse current.The maximum peakcurrent at the output end can reach 186 A.This indicates that the pulse voltage source can effectively increase thecurrent output and improve the system’s load capacity.Compared with traditional improvement methods,this schemenot only improves the system’s anti-interference ability,but also reduces the number of switches used and reduces thecost of pulse power supply.